Lifting-jack



(No Model.)

W.L.'PORTBR-. t V LIFTING JACK. v I 182. Patented Sept. 4, 1883'.

useful improvements in lifting-jacks; and it h new and usefulImprovements in Liftingifacks;

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11"0 all whom it may concern:

UNITED STATES PATENT omen.

WALTER L. 'ronrnn, OF EMLENTON, PENNSYLVANIA.

LlFTlNG-JACK.

srncrnrcnrioiv formingpart of Letters Patent No. 284,482, datedSeptember 4,1883.

Application filed May 10, 1883. (No model.)

Be it known that I, W ALTER L. PORTER, a citizen of the United States ofAmerica, residing at Emlenton, in the countyof Venango and State ofPennsylvania, have invented certain and I do hereby declare. thefollowing to be afull, clear, and exact description of the inven tion,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters-or figures of ref erence marked thereon, which form apart of this specification.

This invention relates to certain new and consists in providing astandard with clamps, whereby a continuous upward movement may be givento thesame by reciprocating the handle attached thereto, whereby aweight may. be raised, as will be hereinafter more fully set forth, andpointed out in the claims.

In the annexed drawings, which illustrate my invention, Figure 1 is aside view, and Fig. 2 is a detail perspective view.

,A represents a rectangular standard, which is attached to thebasebymeans of a crossbar, a, which is bolted thereto. This standard A,as heretofore stated, is rectangular in cross-section, and may be ofanylength de sired, and is of greater width than thickness. 13'represents the operating-handle, which is I cut away or bifurcated atits end next to the standard A. To theends of the projecting portions 6are pivoted links D D, as will be hereinafter set forth.

Secured by means of a pivot, c, which is located on the outer end of thebifurcated portion of the handle B, is a bail, O, which embraces thestandard A, and is provided on its inner portion with a wedge, f, theinner face of which is parallel with the front inner face of the bail G.The lower end of this wedge is provided with a'recess, e, and anoutwardlybent portion, These parts are rigidly secured to eachother, ormay be made, if desirable, out of a single pieceof metal.

E represents another bail or clamp, which encirclesthe standard "A underthe bail O, and it is provided with an outwardly-projecting foot, E,upon which the article to be raised is placed. The forward end of thisbail E is provided with a perforation, through. which passes a bolt, d,for the purpose of connecting the links D D'thereto, the opposite endsof these links being secured to the end of the handle by means of thepivot d. It is evident that these bails O and E may be formed either ofsingle pieces of metal, and have their attachments secured thereto, orthey may be formed of separate pieces of metal, the attachments being ofthe same thickness as the standard A. Thus when the parts are united arectangular opening will be formed in the same of or about the same sizeas the standard A.

- The operation of my invention is as follows;

When no weight is placed upon the projecting foot E, the handle may beraised, and will carry with it the bails O and E; but as soon aspressure is brought to bear against the foot E the lower bail, E, willbe thrown off a horizontal line and will bite the standard. Theinnerlower and the inner upper portions ofthe bail clamp upon the same,and when the weight is desired to be raised it is accomplished byraising the outer end of the handle, which raises the bail 0 upon thestandard, and when the same is depressed it will bite upon the standard,in a manner similar to the lower bail, and the said bail will be raisedand carry the weight with it.

In order to keep the parts located upon the standard, the notch e restsupon the upper part of the lower bail. Thus whenthe weight has beenraised to a sufficient height, both clamps will serve to hold the weightin a raised position. By pressing the handle downward the notch e andpointed wedge f will. throw both the bails in a horizontal position,thus releasing them from the standard and allow ing the parts to slidedownward.

It will be noticed that by my system of leverage I attain great power,and heavy weights may be raised with but little effort.

Having thus described my invention, what I claimas new, and desire tosecure by Letters Patent, is

1. In a' lifting-jaok, the standard, substantially as described,provided with bails O and E, the upper bailbeing pivoted to the ICChandle at c, as shown, said handle being conbail, E, provided with thefoot .E, substan- IO nected to the lower bail, at its outer portion,tially as shown, and for the purpose set forth.

I by the links D D, substantially as shown, and In testimony whereof Iaffix my signature in for the purpose set forth. presence of twowitnesses.

2. The bail or clamp C provided with a wedge, f, having a'notohje, uponits lower WALTER PORTER portion, and pivoted within the bifurcationsW'itnesses: of the handle B, said handle being provided J. HARRYHEASLEY,

with links D D, pivoted thereto, and the lower WILLIAM LEIPLE.

